Man joins the Spanish church (6)
I believe the answer is:
chapel
'church' is the definition.
(I know that chapel is a type of church)
'man joins the spanish' is the wordplay.
'man' becomes 'chap' (term for a man).
'joins' means one lot of letters go next to another.
'the spanish' becomes 'el' ('the' in Spanish).
'chap'+'el'='CHAPEL'
(Other definitions for chapel that I've seen before include "Nonconformist church" , "service" , "religious building" , "Perhaps part of cathedral" , "Part of a large church" .)